Patent · US Expired

Multi variable flatness control system

US6721620B2 · kind B2 · utility

5Cited by

4References

4Claims

0Family size

Assignee

BFI VDeh—Institut fur angewandte Forschung GmbH · DE

Inventors

Mohieddine Jelali · Duisburg, DE
Ullrich Muller · Monheim am Rhein, DE
Gerd Thiemann · Bochum, DE
Andreas Wolff · Munich, DE

Key dates

Filing date	Aug 17, 2001
Grant date	Apr 13, 2004
Priority date	—
Expiry date	Aug 17, 2021

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB65H2557/2644
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

Method of measuring and/or controlling flatness during rolling. The flatness deviation is measured and expressed using orthogonal polynomials. A controlled variable is generated using an Internal Mode Control by comparing the expressed deviation with values of orthogonal polynomials supplied by a model. The comparison provides a control difference to control variables that influence bending, pivoting and axial displacement of the rolls and by multizone cooling.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.